//类型的定义
// type myType = { name: string, age?: number }

// let obj1: myType = { name: "张三", age: 21 }
// let obj2: myType = { name: "李四", age: 23 }
// let obj3: myType = { name: "王五", age: 25 }

// let obj4 = { name: "赵六" }



